fix(gui): bridge quota popover hover gap and link account management

[lidge-jun]

Summary

Carries #6278 by @colthreepv. Moving the pointer from a quota chip to its popover crossed a small gap that closed the popover. The popover footer link to account management also did nothing. A hover bridge now keeps the popover open across the gap, and the footer links to account management.

Maintainer review added two fixes. The chip's aria-describedby now points at the text-only quota table, because the group it pointed at was labeled only with the provider name and lost the quota details under the accessible-description algorithm. The bridge now spans both the chip and popover widths, so wide chips no longer leave an uncovered path. A browser regression covers this, and it fails when the original bridge width is restored.

Supersedes #6278.

Co-authored-by: colthreepv 2657230+colthreepv@users.noreply.github.com

Verification

• GUI bun test tests/quota-summary-bar.test.tsx 10 pass, tests/quota-summary.test.ts 4 pass; GUI and root typecheck, bun run build, bun run lint:gui, structure:check, privacy:scan pass.
• bun tests/quota-summary-hover-browser.ts (new test:quota-hover script): 48 configurations and 144 gap traversals pass, plus account navigation and keyboard Tab/Enter/Escape.
• On current dev: bun x tsc --noEmit, structure:check, test-layout and file-size ratchet guards (27 pass) pass. No dependency changes; gui/package.json only gains the script.
• Cross-platform CI for this head is deferred by the owner's instruction to one run on the final dev tip before release.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

[github-actions]

✅ Deterministic PR hygiene checks passed.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-01T02:25:40.495853Z	f05b408	PR opened

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Reviewing files that changed from the base of the PR and between ee3845f and f05b408.

📒 Files selected for processing (8)

• docs-site/src/content/docs/guides/web-dashboard.md
• gui/README.md
• gui/package.json
• gui/src/components/quota-summary-bar/QuotaSummaryBar.tsx
• gui/src/components/quota-summary-bar/quota-summary-bar.css
• gui/tests/quota-summary-bar.test.tsx
• gui/tests/quota-summary-hover-browser.ts
• structure/dashboard-and-usage.md

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[lidge-jun]

Maintainer integration into dev by @lidge-jun. Carries #6278 with a Co-authored-by trailer; GUI screenshots, review fixes and verification (GUI unit tests, browser regression with 144 gap traversals, lint, build) are in the description. No dependency changes. Cross-platform CI for this head is deferred by the owner's instruction to one run on the final dev tip before release; scripts/ci/assert-mergeable-review.sh --maintainer-integration OK at this head.